Converting azimuth from degrees to radians using Field Calculator; only zeros show up.

I am attempting to convert the azimuth field in a shapefile from degrees to radians using the Field Calculator, but after providing the equation, all the attributes in the new field show up as zero. Equation is [azimuth]*(pi/180). I also tried the calculation using the approximate decimal value of pi/180 and got the same result.

Attached are screenshots of the dialogue window and the problem with the zeros in the attribute table.

Is there a way to fix this without having to use Python or R, and if so how?

I tried that code using the Python parser and got an error that said: "There was a failure during processing. Please check the Geoprocessing window for details." I received Error 000539: Invalid field azim.

I tried again using my field's name, azimuth, in place of azim, and got the same dialogue but with Error 000539: SyntaxError: invalid syntax, (<expression>, line 2). Should there be another pair of parentheses somewhere, perhaps around pi/180?

The only two results I have gotten in all my attempts so far to convert azimuth to radians are either all zeros or this kind of error.

The syntax worked for the first two data sets out of seven after switching to 'Double' fields, but now I am getting this:

I have tried each of the syntax examples provided, exactly as they are with my field name. I changed none of the syntax from the first two datasets that did work vs the two I am working on now that don't work, and yet I received a general syntax error.